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Finding the Fourth Proportional to 222.21, 331.45 and 217.35

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Solution

The fourth proportional to 222.21, 331.45 and 217.35 is: 324.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.21 : 331.45 = 217.35 : x
  2. Step 2: Convert to fraction form
    222.21/331.45 = 217.35/x
  3. Step 3: Cross multiply
    222.21x = 331.45 × 217.35
  4. Step 4: Simplify right side
    222.21x = 72,040.11
  5. Step 5: Solve for x
    x = 72,040.11/222.21
  6. Step 6: Final answer
    x = 324.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.